Saving Wild Places Triggers Unknown Consequences

Many scientists say the Earth is in the midst of its sixth mass extinction. They blame the soaring rate of species loss on global climate change, pollution and habitat loss. In response, some conservationists say introducing new plants and animals or re-introducing old ones will slow the trend. Others fear such "rewilding efforts" will harm the environment in unintended ways. VOA’s Rosanne Skirble reports.